Wednesday

September 28, 2016
Total # Posts: 610

**Physics: Oscillations and spring constant**

A student measured 15s for the 20 complete oscillations for an object of 200g attached at the free end of a spring. Calculate the period of oscillation (T) and the spring constant (k). My work (just wanted to ask for opinions if this is right): T = 2π√(m/k) T = 20 ...

*June 26, 2016*

**English**

help I need a book report on Anastasia. It needs six sentences pls help.

*June 24, 2016*

**chemistry**

The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of an entire DNA double ...

*May 18, 2016*

**chemistry**

The total mass of DNA in the body is 50.0 g. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average length of a single nucleotide is 0.34 nm, what is the length (in km) of one strand of DNA when it is stretched out to its maximum length (...

*May 10, 2016*

**chemistry**

If the average volume of all the blood in a human body is 4700 mL, what is the molarity of DNA in the human blood system?

*May 10, 2016*

**chemistry**

The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of an entire DNA double ...

*May 10, 2016*

**Math**

hello, I'm trying to find the derivative of: y= 1+cos (x) / sin (x) thank you! :)

*May 6, 2016*

**Calculus**

Approximate the change in the lateral surface area(excluding the area of the base) of a right circular cone fixed height of h = 6m when its radius decreases from r=9m to r=8.9m (S=(pi)r sqrt(r^2+h^2)).

*May 3, 2016*

**chemistry**

A hot air balloon is filled with hot air and the hot air forces the volume of the balloon to expand until the density of the gas in the balloon is less than the density of the outside air. The volume must be 20% larger than the balloon would be at STP in order for the balloon ...

*April 25, 2016*

**chemistry**

A 100.0 mL sample of 0.300 M Ca(OH)2 is mixed with 100.0 mL of 0.700 M H3PO4 in a coffee cup calorimeter.If both solutions were initially at 35.0 °C and the resulting solution had a temperature that was recorded at 39. 7°C, determine the ΔHrxn in units of kJ/mol...

*April 25, 2016*

**Math- I'd really appreciate it if you could help!!**

Point $G$ is the midpoint of median $\overline{XM}$ of $\triangle XYZ$. Point $H$ is the midpoint of $\overline{XY}$, and point $T$ is the intersection of $\overline{HM}$ and $\overline{YG}$. Find the area of $\triangle MTG$ if $[XYZ] =150$.

*April 21, 2016*

**Chemistry **

How do you find the mass of iron in audio tapes per metre of tape?

*April 11, 2016*

**civics**

I would be able to check answers for you, but you have to fill out the blanks yourself.

*April 6, 2016*

**college pre calculus**

A kite frame is to be made from 6 pieces of wood. The four border pieces have been cut 5 and 12. The long center piece is 13. what should the length of the cross pieces be in order to maximize the area of the kite.

*February 23, 2016*

**Math**

To the nearest tenth, find the volume of a sphere with a diameter of 10 cm. Use 3.14 for Pi

*February 16, 2016*

**Math**

Solve the following equation with complex numbers and the quadratic formula : 7x^2-4x+2=0 My answer is 4+- 2i√10 ________ 14 My only question is Can this be reduced ?

*February 8, 2016*

**Math **

What is the smallest whole number divisible by both 17 and 8?

*February 3, 2016*

**6th grade math**

$3.05

*February 3, 2016*

**Math**

(8-x)/2=x-2 Solve for x I tried this equation and I cannot get the answer at all

*February 3, 2016*

**Math (calculus )**

I thought in the equation we would plug in what we know and then solve for t?

*February 2, 2016*

**Math (calculus )**

So would I be correct? v(t) =5200-t([5200-1100]/8)

*February 2, 2016*

**Math (calculus )**

Yes that is what I meant to type

*February 2, 2016*

**Math (calculus ) **

A company buys an office machine for $5200 on January 1 of a given year. the machine is expected to last for eight years at the end of which time its trade in value or salvage value will be 1100$. if the company figures the decline in value to be the same each year than the ...

*February 2, 2016*

**Math**

A company buys an office machine for $5200 on January 1 of a given year. the machine is expected to last for eight years at the end of which time its trade in value or salvage value will be 1100$. if the company figures the decline in value to be the same each year than the ...

*February 2, 2016*

**pre-calc college**

a certain type of fencing comes in rigid 10 foot long sections. Four uncut segments are to be used to fence in a garden on the side of a building. what value of x will make the garden as large as possible?

*January 31, 2016*

**Math**

How do I work this out: beth took a math test and scored a 75. She took another math test and scored 20% higher. Whatis her scorefor the second test?

*January 12, 2016*

**Math**

Thanks so much :)

*January 6, 2016*

**Math**

The finale score In a soccer game is 4-3. How many different scores were possible at half time?

*January 6, 2016*

**algebra**

Sara goes on a slingshot ride in an amusement park. She is strapped into a spherical ball that has a radius of centimeters. What is the volume of air in the spherical ball?

*January 5, 2016*

**physics**

A fly of mass .2 g sits 12 cm from the center of a phonograph record revolving 331.3 rpm. a)What is the magnitude of the centripetal force on the fly?b)What is the minimum value of the coefficient of static friction between the fly and the record required to prevent the fly ...

*November 9, 2015*

**science**

A body has been found in a home with the thermostat set at 70 degrees Fahrenheit. The medical examiner measured the core body temperature to be 90.5 degrees. calculate the approximate time of death

*October 22, 2015*

**Business Consulting, Intro to Computers**

• Bill wants the entry in Column G to remind him of expenses that require receipts for the accountant. Tell Bill what to put in Column G to do this: a. Print the word “Yes” in any row where the total daily expenses are greater than or equal to $100.00. b. If the...

*October 15, 2015*

**Physics/trig**

A fire hose ejects a stream of water at an angle of 33.6 ° above the horizontal. The water leaves the nozzle with a speed of 29.6 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?

*October 9, 2015*

**math**

7.88

*September 21, 2015*

**Physical Science**

It would have to use the equation Q=mTCP

*September 14, 2015*

**Bio**

A field mouse eats 10000 g of leaves each year, among other things. Of each gram of leaves has absorbed 150 kj of energy from the sun, about how much energy is available for the mouse?

*September 12, 2015*

**chemistry**

MasteringChemistry said the correct answer is 4.26×10^4 g

*September 8, 2015*

**Physics/trig**

During takeoff, an airplane climbs with a speed of 300 m/s at an angle of 36 degrees above the horizontal. The speed and direction of the airplane constitute a vector quantity known as the velocity. The sun is shining directly overhead. How fast is the shadow of the plane ...

*September 3, 2015*

**Physics PLEASE HELP!**

A bullet whose mass is 1.0 x 10-3 kg leaves a 5.0 kg rifle with a muzzle velocity of 1.0 x 103 m/s. It strikes a stationary block of wood whose mass is 1.0 kg and remains embedded in it. The kinetic energy of the bullet as it travels towards the wooden block is?

*August 17, 2015*

**Physics **

A 1386 kg car traveling at 61 km/h is brought to a stop while skidding 42 m. What is the work done on the car by the frictional forces? (Use formula: v2 = vo2 + 2ad)

*August 17, 2015*

**Physics **

What is the change in velocity (in m/s) if an impulse of 225 N acts on a 4.5 kg mass for 3.0 s?

*August 16, 2015*

**Physics**

A force of 12.0 N acts for 3.7 s on mass M. What impulse (in N*s) is given to the mass?

*August 16, 2015*

**Physics**

A 50.0 g bullet strikes a 7.00 kg stationary wooden block. If the bullet becomes embedded in the block, and the block with the embedded bullet moves off at a velocity of 5.00 m/s, what was the initial velocity of the bullet?

*August 16, 2015*

**Scrambled Paragraph**

I wanted to see if I got it right or wrong.

*August 7, 2015*

**Scrambled Paragraph**

Ugh! That means I failed the test! 😢

*August 7, 2015*

**Scrambled Paragraph **

Architects must consider many factors in designing a building. _1_ Q. Lighting is an essential aesthetic consideration in the design of a building's interior. _4_ R. It's source of daylight, high overhead and filtered through stained glass, creates exciting patterns of...

*August 7, 2015*

**Logical Reasoning **

During the spring, Jim mows his lawn twice per week. During the summer, Jim mows his lawn once per week. A) Jim's lawn grows faster in the summer than in the spring. B) Jim bought a new lawn mower just before summer. C) it is important to Jim to keep his lawn trimmed. D) ...

*August 6, 2015*

**Logical reasoning **

On her way to work today, Wendy paid one dollar more to fill her car's gas tank than she paid one week ago to fill the same tank. A) Wendy's car is leaking gasoline. B) The price of gasoline has gone down. C) Wendy needs her car for transportation. D) Wendy took a trip...

*August 6, 2015*

**Logical Reasoning**

Yea A is supposed to say Rick Spencer is the star of the movie.

*August 6, 2015*

**Logical Reasoning **

A new movie now playing in theaters is based on an old television series. Rick Spencer appears in the movie but did not appear in the television show. A) Rick Spencer is the date of the movie. B) The television show is popular today. C) The television show was cancelled. D) ...

*August 6, 2015*

**Logical Reasoning**

Is it D?

*August 6, 2015*

**Logical Reasoning **

No house lights on this side of the street is on. At every house across the street, at least one light is on. A) Residents on this side of the street are trying to save energy. B) Residents across the street have not turned off their lights. C) It is the middle of the night. D...

*August 6, 2015*

**Math**

There is a right triangle named ABC. If AB=2 yards and BC=6 yards, what is the perimeter of triangle ABC? A) 4*square root of 2 yards B) 8 yards C) 8 + 2*square root of 10 D) 8 + 2*square root of 14 E) 28 yards

*August 6, 2015*

**Math **

What is the fewest number of 7's that can be added together to make their sum greater than 4000? A) 4001 B) 572 C) 571 D) 470

*August 6, 2015*

**Math**

In triangle ABC, the measure of angle A is 80 degrees and the measure of angle B is 50 degrees. If the length of AB is 2x - 12 and the length of AC is x - 3, what is the length of AB? A) 15 B) 12 C) 9 D) 6 E) 3

*August 6, 2015*

**Vocabulary **

"Higher forms of animal life have a variety of systems within their bodies that are used for special functions: a circulatory system for he blood; the food supplier; a digestive system for converting food into energy and body tissue; and others. The definition that ...

*August 5, 2015*

**Vocabulary **

"The Court and its area of control, its jurisdiction, are established in Article III of the Constitution." The word "jurisdiction" means A) the limits within which authority may be exercised B) personnel C) branches throughout the country D) special ...

*August 5, 2015*

**Math**

5 days

*August 5, 2015*

**Math**

The number of seconds in 2 hours equals the number of minutes in how many days?

*August 5, 2015*

**Math**

So it's 6?

*August 5, 2015*

**Math**

I see 12

*August 5, 2015*

**Math**

How many pairs of parallel edges does a rectangular solid have?

*August 5, 2015*

**Math**

Is it 16 + 2(pi)

*August 5, 2015*

**Math**

A circular pizza of radius 8 is cut into 8 equal slices. What is the perimeter of one slice?

*August 5, 2015*

**math**

No. So the answer is B?

*August 5, 2015*

**math**

Which of the following is not a true fact about angles? A) The measure of an angle depends on the amount of rotation. B) Angles depend on the length of the rays that form the angle. C) All right angles are equal in measure. D) All straight angles are equal in measure. Is it A?

*August 5, 2015*

**university of phoenix**

Suppose y is directly proportional to x and that y = 40 when x=5. Complete parts (a)and(b). Find the constant of proportional k. k= (b)use y=ky to find y when x=9 y=

*August 1, 2015*

**math**

The mean salary of 5 employees is $34600. The median is $35700. The mode is $3700. If the highest paid employee gets a $3900 raise, then what is the new mean, median and mode?

*June 13, 2015*

**chemistry**

how to prepare 500ml of a 0.75M Sodium Phosphate buffer solution at pH 7.5, how would you go about doing that?

*May 18, 2015*

**theory of evolution**

MissSmarties, maybe we don't like to learn unnessecary shii like this. Adults need to wake up and realize they are brainwashing us.

*May 18, 2015*

**social studies**

How did abolitionists like Channing justify taking no immediate action against slavery? Please help Miss Sue

*May 17, 2015*

**social studies**

What was the most radical approach to abolition? And was this approach put into action?

*May 17, 2015*

**social studies**

What was the most radical approach to abolition? Was this approach put into action?

*May 17, 2015*

**social studies**

How did abolitionists like Channing justify taking no immediate action against slavery

*May 17, 2015*

**Physics**

idk i have the same question

*April 30, 2015*

**math please help **

Medians line AX and line BY of triangle ABC are perpendicular at point G. Prove that AB = CG. In your diagram, <AGB should appear to be a right angle. Not sure what i need to do for this...

*April 23, 2015*

**Science/Physics **

My question is you walk 3.9 kilometers to school. In gym, you do the 12 minute run and actually make it 2.4 kilometers. After school you walk your friend home first and then go home it is 3.1 kilometers farther than your morning walk to school. What was your total distance ...

*April 15, 2015*

**Math **

A 40-foot by 10-foot rectangular garden is enclosed by a fence. To make the garden larger, while using the same amount of fencing, its shape is changed to a square. How many square feet larger than the old garden is the new garden?

*March 26, 2015*

**math**

1. A helicopter left Calgary and travelled 135 km west into the Rocky Mountains at an average speed of 2x^2 + 3x km/h. The return journey was at an average speed of 4x^2 - 9 km/h. a) Write and simplify an expression for the total flying time in hours. b) If the value of x is 6...

*March 12, 2015*

**math**

A photograph measuring 8 inches by 6 inches is surrounded by a mat. The mat has the same width on all sides of the photograph. The photograph and mat are put into a glass photo frame which just covers the outside of the mat. If the area of the glass surface is 120 square ...

*March 8, 2015*

**Physics 2 **

Using the diagram to the left, rank each of the given paths on the basis of the change in electric potential. Rank the largest-magnitude positive change (increase in electric potential) as largest and the largest-magnitude negative change (decrease in electric potential) as ...

*February 16, 2015*

**Chemistry **

How do you change 15% to moles

*February 1, 2015*

**Chemistry **

Determine the molarity of a 15.0 % by mass Hydrogen Peroxide solution. The density of Hydrogen Peroxide is 1.054 g/mL. The 15.0% by mass can be broken apart into 15.0 g Hydrogen Peroxide and 100.0 g solution. Use the density of Hydrogen Peroxide solution (1.054 g/mL) to ...

*February 1, 2015*

**Chemistry **

Determine the moles of Potassium Iodate present in a 0.267 m Potassium Iodate solution assuming you have 1 kg of solvent (H2O) present.

*February 1, 2015*

**math**

. Darya's car averages 36 miles per gallon. How many gallons of gas will she need for a 480-mile trip? What is the cost of the gas she needs if gas costs $3.12 per gallon?

*December 12, 2014*

**Math**

When Curtis was born, his parents began depositing $1000 at the end of every year into an annuity to save for his college education. If the account paid 7% compounded annually for the first 10 years and then dropped to 5% for the next eight years, how much is the account worth...

*December 10, 2014*

**Math Help**

You don't have to yell, Ms. Sue. It was all just a misunderstanding. Callie just thought that you had forgot to answer her question. So, I understand why she reposted. No need to get mad.

*December 8, 2014*

**Math with business apps**

Young and Company owes bond holders $5,500 interest at the end of each quarter for the next five years. How much must they deposit now at 8% interest compounded quarterly to yield an annuity payments of $5,500?

*December 6, 2014*

**Physics**

A jet transport has a weight of 2.03 x 106 N and is at rest on the runway. The two rear wheels are 16.0 m behind the front wheel, and the plane's center of gravity is 12.1 m behind the front wheel. Determine the normal force exerted by the ground on (a) the front wheel and...

*December 1, 2014*

**Physics**

The wheels, axle, and handles of a wheelbarrow weigh W = 65 N. The load chamber and its contents weigh WL = 538 N. The drawing shows these two forces in two different wheelbarrow designs. To support the wheelbarrow in equilibrium, the man’s hands apply a force to the ...

*December 1, 2014*

**Math with business apps**

hahah sorry. No one was answering so I thought id try a different name

*November 24, 2014*

**Math with business apps**

How much should be invested at 6% compounded monthly so that the investment will be worth $20,000 in six years?

*November 24, 2014*

**Math with business apps**

You invest $5000 at 3% compounded monthly for 15 years. How much interest will you earn?

*November 24, 2014*

**Math with business apps**

Tom invested $7,000 at 6.5% interest compounded monthly. How much will be in this account after 18 months?

*November 24, 2014*

**Math Help**

Dear Callie, Yes, the answer to your problem is C. All you needed to do was divide 33.6 by 6 and you would have your answer.

*November 20, 2014*

**Physics**

A stone is thrown horizontally at 30.0m/s {\rm m}/{\rm s} from the top of a very tall cliff. Calculate its horizontal position and vertical position at 2 s {\rm s} intervals for the first 10.0s {\rm s} a)Calculate the horizontal x and vertical y positions at time t = 2 s

*October 22, 2014*

**chemistry**

What is the pH of a solution of a monoprotic acid with a pKa of 6.6 if it is 39.3 % ionized in solution? Just provide the numerical answer, do not prefix with pH. Give your answer to two decimal places. Remember the definition of Ka

*October 19, 2014*

**Chemistry**

A pure copper sphere ha a radius of 0.935in. How many moles of copper does it contain? The volume of a sphere is (4/3)3.14r^3, and the density of the copper is 8.96g/cm^3. (1 in. = 2.54cm)

*October 14, 2014*

**math**

The school colors are blue and white. Elizabeth has 84 blue balloons and 96 white balloons. How many balloon bouquets can she make if she wants to haVe the same number of each color in each bouquet and use all balloons?

*October 8, 2014*

**math**

Riding on a school bus are 20 students in 9th grade, 10 in 10th grade, 9 in 11th grade, and 7 in 12th grade. Approximately what percentage of the students on the bus are in 9th grade?

*October 6, 2014*